Quick details
• Fast response to surge current
• High material constant (B value)
• Low residual resistance
• Wide operating temperature range -55 to +200C
• R25 allowable tolerance is ±20%
Description
The MF72 series Power NTC Thermistors provide inrush current suppression for sensitive electronics. Connecting a MF72 in series with the power source will limit the current surges typically created at turn on. Once the circuit is energized the resistance of the MF72 will decrease rapidly to a very low value, power consumption can be ignored and there will be no effect on normal operating current. Using the MF72 Power NTC Thermistor is a most cost-effective way to curb surge current and protect sensitive electronics from damage.
Application
• Power supplies and inverters
• Uninterruptible Power Supplies
• Energy saving lamps
• Electronic Ballasts
• Filament Protection of various types of lamps
Specification
 Specification
|
Dimensions
| Part No./Dim (mm)/Sym | Dmax | Tmax | d
+/- 0.05
Fig. II/I | F1
+/-1
Fig. II/I | F2
+/-1.5
Fig. II/I | Straight Lead Wire | Curved Lead Wire | A
+/- .5 | | Lmin | b
L1min | L2+/-2 | | MF72- D5 | 7 | 5 | 0.6/0.45 | 5/2.5 | 3 | 25 * | 17/5 | 8/5 | 1.65 | | MF72- D7 | 9 | 5 | 0.6 | 5 | 3 | 25 | 17/5 | 8/5 | 1.9 | | MF72- D9 | 11 | 5.5 | 0.8/0.6 | 7.5/5 | 5/3 | 25 | 17/5 | 8/5 | 2.3 | | MF72- D11 | 13 | 5.5 | 0.8 | 7.5/5 | 5/3 | 25 | 17/5 | 8/5 | 2.6 | | MF72- D13 | 15.5 | 6 | 0.8 | 7.5 | 5 | 25 | 17/5 | 8/5 | 2.6 | | MF72- D15 | 17.5 | 6 | 0.8 | 10/7.5 | 5 | 25 | 17/5 | 8/5 | 2.8 | | MF72- D20 | 22.5 | 7 | 1.0 | 10/7.5 | / | 25 * | / | / | 3.5 | | MF72- D25 | 27.5 | 8 | 1.0 | 10 | / | 25 * | / | / | 3.5 | | Remark | b, 17/5 17 indicates the long bent lead wire, 5 indicates the short bent lead wire (Fig. III)
Illustration: In general, the long bent lead wire is used, see figure II
Add suffix "L" + Fig. # to specify optional leads.
* Straight Leads Are Standard | |
| Main Techno Parameter | Part NO. | R25
(Ω) | Max.
Steady State Current
(A) | Approx.R of Max.Cur
(Ω) | Dissi,Coef.
(mW/ƒC) | Thermal time Constant
(S) | Max. Load
Capacitance
in uF | UL Recognized | Operating Temp.
(ƒC) | | 120 VAC | 240 VAC | | MF72-5D5 | 5 | 1 | 0.353 | 6 | 20 | 188 | 47 | | -55 to +200 | | MF72-10D5 | 10 | 0.7 | 0.771 | 6 | 20 | 188 | 47 | | | MF72-60D5 | 60 | 0.3 | 1.878 | 6 | 18 | 188 | 47 | | | MF72-200D5 | 200 | 0.1 | 18.70 | 6 | 18 | 88 | 22 | | | MF72-5D7 | 5 | 2 | 0.283 | 10 | 30 | 224 | 56 | | | MF72-8D7 | 8 | 1 | 0.539 | 9 | 28 | 224 | 56 | | | MF72-10D7 | 10 | 1 | 0.616 | 9 | 27 | 224 | 56 | | | MF72-12D7 | 12 | 1 | 0.816 | 9 | 27 | 224 | 56 | | | MF72-16D7 | 16 | 0.7 | 1.003 | 9 | 27 | 224 | 56 | | | MF72-22D7 | 22 | 0.6 | 1.108 | 9 | 27 | 224 | 56 | | | MF72-33D7 | 33 | 0.5 | 1.485 | 10 | 28 | 188 | 47 | | | MF72-200D7 | 200 | 0.2 | 11.65 | 11 | 28 | 188 | 47 | | | MF72-3D9 | 3 | 4 | 0.120 | 11 | 35 | 272 | 68 | √ | | MF72-4D9 | 4 | 3 | 0.190 | 11 | 35 | 272 | 68 | √ | | MF72-5D9 | 5 | 3 | 0.210 | 11 | 34 | 272 | 68 | √ | | MF72-6D9 | 6 | 2 | 0.315 | 11 | 34 | 272 | 68 | √ | | MF72-8D9 | 8 | 2 | 0.400 | 11 | 32 | 400 | 100 | √ | | MF72-10D9 | 10 | 2 | 0.458 | 11 | 32 | 400 | 100 | √ | | MF72-12D9 | 12 | 1 | 0.652 | 11 | 32 | 400 | 100 | √ | | MF72-16D9 | 16 | 1 | 0.802 | 11 | 31 | 400 | 100 | √ | | MF72-20D9 | 20 | 1 | 0.864 | 11 | 30 | 600 | 150 | √ | | MF72-22D9 | 22 | 1 | 0.950 | 11 | 30 | 600 | 150 | √ | | MF72-30D9 | 30 | 1 | 1.022 | 11 | 30 | 600 | 150 | √ | | MF72-33D9 | 33 | 1 | 1.124 | 11 | 30 | 600 | 150 | √ | | MF72-50D9 | 50 | 1 | 1.252 | 11 | 30 |
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